The Delta Star product list goes far beyond power transformers. We have a strong reputation for providing the flexibility to build Auto and Ground Transformers, Voltage Regulators, Mobile Circuit Protectors, and Mobile and Portable Substations. As a result, Delta Star is the only North American transformer manufacturer with the breadth of products to meet all your power needs.



Below is a partial list of our capabilities, including MVA and voltages:


Type

MVA (Top Rating)

HV kV*

LV kV

Power Transformer w/o LTC 200 15 – 315 4 – 115
Power Transformer w/ LTC  170 15 – 315 4  – 115
Auto Transformer & TV w/o LTC 300 69 – 315 34.5 – 161
Auto Transformer & TV w/ LTC 250 69 – 315 34.5 – 161
Voltage Regulator 7 15 – 115 +/-10-15% Regulation
Grounding Transformer - 15 – 115 Custom Z% or I-fault
Generator Step-up  Same Ratings as Type 1 & 2 
Unit Auxiliary 60 15 – 34.5 2.4 – 25
Mobile Substation <100 25 – 230 2.4 – 69
Portable Substation 100 15 – 230 2.4 – 69
Mobile Circuit Protection  - 15 - 230  -
*Delta Star can manufacture up to 345 kV at 1050 BIL



Many factors influence the above criteria, such as:
  • Impedance
  • Sound Level
  • Loss Evaluation
  • Temperature Rise
  • Basic Impulse Level (BIL)
  • Limiting Dimension
  • State Highway Road Limits (Mobile Transformers)